Plunger structure and plunger pump

ABSTRACT

A plunger structure and a plunger pump are provided, relating to the technical field of plunger pumps. In one exemplary implementation, the plunger structure may comprise a plunger body with both ends closed, an engagement groove disposed at the top of the plunger body, a plunger cap fixedly connected to the engagement groove, and/or an elastic member having one end fixedly disposed within the plunger cap. The plunger body may be sheathed in the elastic member. According to other aspects, a top end of the plunger body may be exposed out from the plunger cap, an engagement groove that is depressed inwardly may be formed in a circumferential direction of the top of the plunger body, an inside of the plunger body may be in a cavity structure, and/or the plunger body may be an integrally molded part.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit/priority to Chinese Patent ApplicationNo. 201710470921.8, filed Jun. 20, 2017, published as ______, andentitled “Plunger Structure and Plunger Pump,” the contents of which areherein incorporated by reference in their entirety.

BACKGROUND Field

The present disclosure relates to the technical field of plunger pumps,and in particular to a plunger structure (plunger piston structure) anda plunger pump (plunger piston pump).

Description of the Related Art

In industrial manufacturing and daily life, the cleaning and removal ofimpurities from a device or an article is generally performed by using ahigh-pressure water gun. Among them, in the high-pressure washerindustry, a power component of the washer mostly employs a plunger pump.For the plunger pump, normal operation of a body is achieved by causinga change of the sealed volume depending on a reciprocating movement of aplunger in a cylinder bore. Thus, the plunger is an important part forthe normal operation of the plunger pump. The performance of the plungerdirectly affects the working performance of the plunger pump.

Prior plungers mainly include solid plungers and open hollow plungers.The solid plunger requires many materials and has high production cost.Moreover, the solid structure causes a heavy overall weight, whichresults in greater friction between the plunger and the plunger pumpduring working, reducing the working efficiency of the plunger pump. Theopen hollow plunger is easily deformed during the production process,and under a working state, the plunger body is subjected to ahigh-temperature and humid environment so that the inner wall is proneto rust to damage the plunger body, thus the open hollow plunger hasshort service life, and therefore has the technical problems of lowworking efficiency and short service life.

OVERVIEW OF SOME ASPECTS

Implementations of the disclosed technology provide a plunger structureand a plunger pump, to alleviate the technical problem that a hollowplunger of the prior art has low working efficiency and short servicelife.

According to one example, a plunger structure provided according todisclosed technology may comprise a plunger body with both ends closed,an engagement groove disposed at the top of the plunger body, a plungercap fixedly connected with the engagement groove, and an elastic memberhaving one end fixedly disposed within the plunger cap, wherein theplunger body is sleeved in the elastic member, and the plunger body isan integrally molded part.

According to certain implementations, a top end of the plunger body maybe exposed out from the plunger cap, an engagement groove that isdepressed inwardly may be formed in a circumferential direction of thetop of the plunger body, and/or an inside of the plunger body may be ina cavity structure.

In additional implementations, the plunger cap may comprise a skirtportion and a plurality of triangular claws which extend upwardly andare formed along a top edge of the skirt portion.

Here, for example, the plurality of triangular claws may becircumferentially disposed at equal intervals around a centerline of theskirt portion, and the plurality of the triangular claws may all beengaged with the engagement groove.

In further implementations, the plurality of triangular claws may allconverge toward the centerline of the skirt portion, and/or an aperturesize of an opening delimited (defined) by the plurality of triangularclaws may be equal to a diameter size of the engagement groove.

Further, the elastic member may be a spring, and one end of the springmay be engaged within the skirt portion.

Further, the plunger body may be a part integrally molded by coldforging.

Some beneficial effects of the disclosed technology include thefollowing:

The plunger structure in the present disclosure may comprise a plungerbody with both ends closed and an engagement groove disposed at the topof the plunger body, wherein the engagement groove is, e.g., formed byrecessing inwardly in a circumferential direction of the top of theplunger body, and an inside of the plunger body is in a cavitystructure. Since the inside of the plunger body is in a cavitystructure, the weight of the plunger body is reduced, thereby reducingthe inertia of the plunger structure during its operation within theplunger pump, increasing the rotational speed of the plunger pump, andincreasing the self-priming property of the plunger pump, therebyimproving the working efficiency of the plunger pump. Here, the plungerwith an internal cavity structure also saves processing materials,thereby reducing the production cost of the plunger structure.

Moreover, according to the characteristics of sound transmission, whensound is transmitted from one medium to the next medium, if two adjacentmedia are made of different materials, there is a great difference inresonance frequency between the media, and then a loss of sound energywill be caused. When the plunger body is working, noise generated duringthe movement of the plunger body is transmitted from one side of theplunger body to air in the hollow inside, and then transmitted to theother side of the plunger body. During the process, the media adjacentto each other are different, thus the energy of sound is greatly lost,and the noise generated when the present plunger works is reduced.

In addition, the plunger body may be an integrally molded part, whichprevents the plunger body from being broken under a strong working stateof the plunger structure, prolongs the service life of the plungerstructure, and/or thereby also allows a plunger pump to work morestably, which may also improve the working efficiency of the plungerpump, and/or enable improve practical usage and functionality.

According to the disclosed technology, a plunger pump having the plungerstructure described above may be provided.

In certain implementations, the plunger pump may further comprise a pumpbody and a motor actuating movement of the pump body, wherein the pumpbody may be fixedly connected with an inlet pipe and an outlet pipesequentially, and an overflow valve may be disposed between the inletpipe and the outlet pipe.

In further implementations, a piston ring may be provided in the pumpbody, the piston ring configured to be connected with the plunger body,wherein the piston ring may comprise a piston ring body, a plungersleeve positioned inside the piston ring body, and a reinforcing ribpositioned between an outer wall of the plunger sleeve and an inner wallof the piston ring body. Further, one or both of the plunger sleeve andthe piston ring body may be fixedly connected with the reinforcing rib.

Additionally, a sealing gasket may be disposed between the pump body andthe plunger sleeve, such as a position or location where the pump bodyis connected with the plunger sleeve, or to otherwise seal a juncturebetween or associated with these elements.

According to some implementations, the plunger pump may further comprisea controller, a buzzer for alarm, a switch provided with a solenoidvalve, a current overload protector configured to detect a current,and/or a temperature sensor configured to detect a temperature of thepump body. wherein the buzzer, the switch, the overload protector, andthe temperature sensor are all electrically connected with thecontroller.

The beneficial effects of the technology disclosed above are as follows:

Such plunger pump has the same advantages as those of the plungerstructure described above, which are incorporated here by reference.

BRIEF DESCRIPTION OF THE DRAWINGS

For illustrating technical solutions of various implementations of thedisclosed technology or over the prior art more clearly, drawingsrequired for use in the description of the specific implementations orthe prior art will be introduced briefly below. Obviously, the drawingsbelow are merely illustrative of some implementations of the presentdisclosure. It would be understood by those of ordinary skill in the artthat other relevant drawings could also be obtained from these drawingswithout using inventive efforts.

FIG. 1 is a structural schematic view of a plunger structure accordingto an illustrative implementation of disclosed technology.

FIG. 2 is a structural schematic view showing connection between aplunger body and a plunger cap of the illustrative plunger structure inFIG. 1.

FIG. 3 is a sectional view of a plunger body of the illustrative plungerstructure shown in FIG. 1.

FIG. 4 is a structural schematic view showing connection between apiston ring and a plunger structure positioned within a plunger pumpaccording to illustrative implementations of the disclosed technology.

Reference numerals in the drawings: 1—plunger body; 2—plunger cap;3—spring; 4—piston ring; 11—engagement groove; 21—skirt portion;22—triangular claw; 41—piston ring body; 42—plunger sleeve;43—reinforcing rib.

DETAILED DESCRIPTION OF ILLUSTRATIVE IMPLEMENTATIONS

Various technical solutions of the disclosed technology will bedescribed below with reference to the accompanying drawings. Theimplementations described are some, but not all, of the implementationsconsistent with the disclosed and claimed technology. Otherimplementations obtained by those of ordinary skill in the art in lightof the implementations of the disclosed technology without inventiveefforts fall within the scope of the present disclosure as claimed.

In the description of the present disclosure, it should be noted thatorientation or positional relations indicated by the terms such as“center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”,“inside”, “outside”, etc. are the orientation or positional relationsshown based on the figures, and these terms are intended only tofacilitate the description of the present disclosure and simplify thedescription, but not intended to indicate or imply that the referreddevices or elements must be in a particular orientation or constructedor operated in the particular orientation, and therefore should not beconstrued as limiting the present disclosure. In addition, terms such as“first”, “second”, and “third” are used only for descriptive purpose,and should not be understood as indicating or implying to haveimportance in relativity.

In the description of the present disclosure, it should also be notedthat unless otherwise expressly specified or defined, terms “mounted”,“coupled”, and “connected” should be understood broadly. For example, aconnection may be a fixed connection, a detachable connection, or anintegral connection, it may be mechanical connection or an electricalconnection, or may be direct coupling or indirect coupling via anintermediate medium or internal communication between two elements. Thespecific meanings of such terminology in the present disclosure shouldbe understood by those of ordinary skill in the art according to theirspecific usage/situations.

Implementation 1

As shown in FIG. 1, FIG. 2 and FIG. 3, the present implementationprovides a plunger structure comprising a plunger body 1 with both endsclosed, an engagement groove 11 disposed at the top of the plunger body1, a plunger cap 2 fixedly connected with the engagement groove 11, andan elastic member having one end fixedly disposed within the plunger cap2, wherein the plunger body 1 is sleeved (sheathed) in the elasticmember, and the plunger body 1 is an integrally molded part.

A top end of the plunger body 1 extends or is exposed out from theplunger cap 2, the engagement groove 11 which is depressed inwardly isformed in a circumferential direction of the top of the plunger body 1,and an inside of the plunger body 1 may be formed with a cavitystructure.

The plunger structure in the present implementation comprises a plungerbody 1 with both ends closed and an engagement groove 11 disposed at thetop of the plunger body 1. The engagement groove 11 which is depressedinwardly is formed in a circumferential direction of the top of theplunger body 1, and an inside of the plunger body 1 may have a cavitystructure. Since the inside of the plunger body 1 has a cavity, theweight of the plunger body 1 is reduced, thereby reducing the inertia ofthe plunger structure during its operation within the plunger pump,increasing the rotational speed of the plunger pump, and increasing theself-priming property of the plunger pump, thereby improving the workingefficiency of the plunger pump. Here, a plunger with an internal cavityalso saves processing materials, thereby reducing the production cost ofthe plunger structure.

Moreover, according to the characteristics of sound transmission, whensound is transmitted from one medium to the next medium, if two adjacentmedia are made of different materials, there is a great difference inresonance frequency between the media, and then a loss of sound energywill be caused. When the plunger body 1 is working, noise generatedduring the movement of the plunger body 1 is transmitted from one sideof the plunger body 1 to air in the hollow inside, and then transmittedto the other side of the plunger body 1. During the process, the mediaadjacent to each other are different, thus the sound energy may begreatly expended, and the noise generated when the plunger structureworks is reduced.

In addition, the plunger body 1 may be an integrally molded part, whichprevents the plunger body 1 from being broken under a strong workingstate of the plunger structure, prolongs the service life of the plungerstructure, and thereby also allows a plunger pump to work more stably,improving the working efficiency of the plunger pump, and enabling goodpracticability and functionality.

In the present implementation, the plunger body 1 is sheathed or sleevedin the elastic member. When the plunger pump is working, the plungerbody 1 moves downward. Since one end of the elastic member is fixedlydisposed within the plunger cap 2, and the plunger cap 2 is fixedlyconnected with the engagement groove 11, the plunger body 1 drives theplunger cap 2 to move downward synchronously. During such movement, theplunger cap 2 compresses the elastic member so that the elastic memberis deformed, and at the same time, the volume in the plunger pump isreduced during the downward movement of the plunger body 1, and a liquidsuch as water or oil or the like is conveyed out under the action ofpressure difference so as to achieve the purpose of conveying the liquidsuch as water or oil or the like. When the plunger body 1 moves to thefarthest position, since the elastic member is deformed, the plungerbody 1 returns to the initial position under the action of an elasticforce generated after the deformation of the elastic member, that is,one reciprocating movement of the plunger body 1 is completed. Further,here, the plunger cap 2 and the plunger body 1 may be fixedly connectedtogether through the engagement groove 11. This structure is simple andis readily and conveniently detachable, and a damaged plunger cap 2 orelastic member can be easily replaced. The elastic member is fixedlydisposed within the plunger cap 2, the elastic member is compressed whenthe plunger body 1 drives the plunger cap 2 through movement, and theplunger body 1 rebounds to the initial position under the elastic forcegenerated after the deformation of the elastic member to complete theoperation of the plunger pump. This is a novel design with a reasonablestructure, and this further improves the functionality and practicalityof the plunger structure.

As shown in FIG. 1 and FIG. 2, specifically, the plunger cap 2 maycomprise a skirt portion 21 and a plurality of triangular claws 22 whichextend upwardly and are formed along a top edge of the skirt portion 21.

The plurality of triangular claws 22 may be disposed circumferentiallyat equal intervals around a centerline of the skirt portion 21, and theplurality of triangular claws 22 are all engaged with the engagementgroove 11.

In the present implementation, the plunger cap 2 may comprise a skirtportion 21 and a plurality of triangular claws 22 which extend upwardlyand are formed along a top edge of the skirt portion 21. The pluralityof triangular claws 22 may be engaged with the engagement groove 11, andthe elastic member is fixedly disposed within the skirt portion 21. Whenthe plunger body 1 drives the plunger cap 2 to move downwardsynchronously, the skirt portion 21 compresses the elastic member sothat the elastic member is deformed, and at the same time, the elasticmember gives the skirt portion 21 an upward acting force, therebyallowing tight abutment of the plurality of triangular claws 22 againstthe engagement groove 11, to ensure that the plunger cap 2 and theplunger body 1 are firmly connected together, and to prevent the plungercap 2 from being disengaged from the engagement groove 11 during themovement of the plunger body 1, thereby further improving thefunctionality and practicality of the plunger body 1.

With continued reference to FIG. 1 and FIG. 2, here in the presentimplementation, the plurality of triangular claws 22 may all convergetoward the centerline of the skirt portion 21, and an aperture size ofan opening delimited by the plurality of triangular claws 22 may beequal to a diameter size of the engagement groove 11. Since the aperturesize of the opening delimited by the plurality of triangular claws 22 isequal to the diameter size of the engagement groove 11, when theplurality of triangular claws 22 are engaged with the engagement groove11, the plurality of triangular claws 22 all have the tendency ofexpanding outwardly, that is, the plunger cap 2 is tightly fixedtogether with the engagement groove 11 under the action of a tensiongenerated by the triangular claws 22, further improving the firmness ofthe connection between the plunger cap 2 and the plunger body 1 andpreventing disengagement of the plunger cap 2 from the plunger body 1during the reciprocating movement of the plunger body 1.

In the illustrative implementation(s) shown, the elastic member may be aspring 3, and one end of such spring 3 may engaged within the skirtportion 21. During the movement of the plunger body 1, the plunger cap 2compresses the spring 3 so that the spring 3 is deformed, and at thesame time, the plunger body 1 presses the cavity in the plunger pump sothat the volume in the plunger pump is reduced, thereby achieving thepurpose of conveying a medium. When the plunger body 1 moves to thefarthest position, where the elastic member is deformed, the plungerbody 1 returns to the initial position under the action of an elasticforce generated after the deformation of the elastic member, that is,one reciprocating movement of the plunger body 1 is completed. Inaddition, such spring 3 is a mechanical part that works using elasticproperty, and has a characteristic that it deforms under the action ofan external force and restores its original shape after the externalforce is removed. With such characteristic of the spring 3, the movementof the mechanism can be well controlled to realize the function ofreturning to an initial position of the mechanism.

Further, consistent with the present implementation, the plunger body 1may be a part integrally molded by cold forging. Cold forged molding canenable/realize large-scale production and has the characteristics ofshort processing period, simple operation, and low manufacturing cost.Moreover, cold forged molding enables one-step molding of a productduring processing of the product, avoiding the deformation of theproduct caused by heat during the production process.

In accord with present implementation(s), the plunger body 1 may beprocessed by the following procedures. First, a plunger blank may bemolded in one step by a cold forging process and an open hollow plungerblank is formed. After the hollow plunger blank is molded, an opening ofthe plunger blank is subjected to sealing treatment by performinghigh-frequency or intermediate-frequency localized heating androller-extrusion sealing process (i.e., a process of high-frequency orintermediate-frequency localized heating, roller extruding and sealing)at one end of the plunger blank having the opening. And, after thesealing treatment of the opening of the plunger body 1 is completed, anengagement groove 11 is processed at the top of the plunger blank, e.g.,by a turning process, so as to complete the processing and manufactureof the final molded plunger body 1.

Implementation 2

In this second implementation, a plunger pump is provided having theplunger structure described in Implementation 1, above.

Such plunger pump includes the same advantages as those described aboveregarding the aforementioned plunger structure, said advantages beingincorporated into this implementation, as well.

According to this present implementation, the plunger pump furthercomprises a pump body and a motor actuating movement of the pump body.The pump body may be fixedly connected with an inlet pipe and an outletpipe sequentially, and an overflow valve is disposed between the inletpipe and the outlet pipe.

According to the present implementation, when the plunger pump isworking, the medium flows from the inlet pipe, through the pump body andthen out of the outlet pipe. Here, an overflow valve may be disposedbetween the inlet pipe and the outlet pipe. The overflow valve may alsohave a unidirectional flowing mechanism and/or characteristic, such thata liquid such as water or oil or the like cannot flow back from theoutlet pipe into the pump body. This prevents damage to the pump bodycaused by the backflow of the liquid such as water or oil or the like,and at the same time, ensures the outflow of all the liquid such aswater or oil or the like through the outlet pipe and improves theworking efficiency of the pump body.

As shown in FIG. 4, here, the pump body is provided therein with apiston ring 4 for connection to the plunger body 1. The piston ring 4may comprise a piston ring body 41, a plunger sleeve 42 positionedinside the piston ring body 41, and a reinforcing rib 43 positionedbetween an outer wall of the plunger sleeve 42 and an inner wall of thepiston ring body 41. One or both the plunger sleeve 42 and/or the pistonring body 41 may be fixedly connected with the reinforcing rib 43.

Consistent with the present implementation, when the plunger pump isworking, the plunger body 1 may move downward along the plunger sleeve42 and drive the plunger cap 2 to move downward synchronously. Duringthe downward movement of the plunger body 1, the skirt portion 21compresses the spring 3 so that the spring 3 is deformed, and theplunger sleeve 42 can ensure that the plunger body 1 does not deviatefrom the movement track, and at the same time can prevent swinging ofthe plunger body 1 during the movement, thereby improving the operationstability and working efficiency of the plunger pump. As such, accordingto some aspects, the reinforcing rib 43 improves the strength of theentire piston ring 4 and prolongs the service life of the entire pistonring 4.

Here, in the present implementation, the pump body and the plungersleeve 42 may be connected with each other at a position where a sealinggasket is disposed. The sealing gasket may ensure air-tightness at aposition where the pump body is connected with the plunger sleeve 42, soas to ensure enough pressure inside the pump body during working of theplunger pump to prevent the situation that outflowing amount of theliquid such as water or oil or the like at the outlet pipe is relativelysmall due to insufficient internal pressure during the working of thepump body, thereby further improving the working efficiency of theplunger pump.

Consistent with the present implementation, the sealing gasket may be asilicone gasket. Such silicone gasket has good ductility, air-tightness,has non-toxic and odorless characteristics, is low-carbon,environmentally friendly, has a very clean and sanitary surface, isinexpensive in price, and has a wide range of sources available in themarket.

Further, the plunger pump may further comprise a controller, a buzzerfor alarm, a switch provided with a solenoid valve, a current overloadprotector for detecting the current, and/or a temperature sensor fordetecting the temperature of the pump body. The buzzer, the switch, theoverload protector, and/or the temperature sensor are all electricallyconnected with the controller.

In the present implementation, when the plunger pump is working, themaximum current value that can be tolerated when the plunger pump is inoperation may be set in the current overload protector. Here, forexample, when the current in the circuit exceeds the set value in thecurrent overload protector, the current overload protector may send asignal to the controller, and the controller receives the correspondingsignal and then takes an action. The controller may control the solenoidvalve to be closed so as to cut off a power switch of the plunger pumpto prevent damage, such as over-burning, etc., of the pump body whichmay cause heat incidents or damage and even a fire accident in a seriouscase. As such, the safety of the plunger pump is thereby improved.

Moreover, the plunger pump may further comprise a temperature sensor,wherein the highest temperature value at which the plunger pump works isset in the temperature sensor. When the temperature value of the pumpbody exceeds the set value of the temperature sensor, the temperaturesensor sends a signal to the controller, and the controller receives thecorresponding signal and then takes an action. The controller mayinstruct the buzzer to give an alarm for warning and alerting to preventdamage to the pump body due to an excessive temperature so as to furtherimprove the practicability and functionality of the plunger pump.

Finally, it should be noted that the above implementations are onlyintended to illustrate, but not limit, the inventiveness and technicalsolutions of the disclosed technology. Although the present disclosurehas been described in detail with reference to the foregoingimplementations, it should be understood by those of ordinary skill inthe art that it is still possible to modify aspects and/or technicalsolutions described in the foregoing implementations or equivalentlyreplace some or all of the technical features; and these modificationsor substitutions do not cause the essence of the corresponding systemsand/or methods to depart from the scope of innovations or the technicalsolutions of the implementations of the disclosed technology.

What is claimed is:
 1. A plunger structure, comprising a plunger body with both ends closed, an engagement groove provided at a top of the plunger body, a plunger cap fixedly connected with the engagement groove, and an elastic member having one end fixedly provided within the plunger cap, wherein the plunger body is sleeved in the elastic member, and the plunger body is an integrally molded part; and a top end of the plunger body is exposed out from the plunger cap, the engagement groove which is depressed inwardly is formed in a circumferential direction of the top of the plunger body, and an inside of the plunger body is in a cavity structure.
 2. The plunger structure according to claim 1, wherein the plunger cap comprises a skirt portion and a plurality of triangular claws which extend upwardly and are formed along a top edge of the skirt portion; the plurality of triangular claws are circumferentially disposed at equal intervals around a centerline of the skirt portion, and the plurality of the triangular claws are all engaged with the engagement groove.
 3. The plunger structure according to claim 2, wherein the plurality of triangular claws all converge toward the centerline of the skirt portion, and an aperture size of an opening delimited by the plurality of triangular claws is equal to a diameter of the engagement groove.
 4. The plunger structure according to claim 3, wherein the elastic member is a spring, and one end of the spring is engaged within the skirt portion.
 5. The plunger structure according to claim 3, wherein the plunger body is a part that is integrally molded by cold forging.
 6. The plunger structure according to claim 4, wherein the plunger body is a part that is integrally molded by cold forging.
 7. A plunger pump, comprising a plunger structure, wherein the plunger structure comprises a plunger body with both ends closed, an engagement groove provided at a top of the plunger body, a plunger cap fixedly connected with the engagement groove, and an elastic member having one end fixedly provided within the plunger cap, wherein the plunger body is sleeved in the elastic member, and the plunger body is an integrally molded part; and a top end of the plunger body is exposed out from the plunger cap, the engagement groove which is depressed inwardly is formed in a circumferential direction of the top of the plunger body, and an inside of the plunger body is in a cavity structure.
 8. The plunger structure according to claim 7, wherein the plunger cap comprises a skirt portion and a plurality of triangular claws which extend upwardly and are formed along a top edge of the skirt portion; the plurality of triangular claws are circumferentially disposed at equal intervals around a centerline of the skirt portion, and the plurality of the triangular claws are all engaged with the engagement groove.
 9. The plunger structure according to claim 8, wherein the plurality of triangular claws all converge toward the centerline of the skirt portion, and an aperture size of an opening delimited by the plurality of triangular claws is equal to a diameter of the engagement groove.
 10. The plunger structure according to claim 9, wherein the elastic member is a spring, and one end of the spring is engaged within the skirt portion.
 11. The plunger structure according to claim 9, wherein the plunger body is a part that is integrally molded by cold forging.
 12. The plunger structure according to claim 11, wherein the elastic member is a spring, and one end of the spring is engaged within the skirt portion.
 13. The plunger pump according to claim 7, further comprising a pump body and a motor configured for actuating movement of the pump body, wherein the pump body is fixedly connected with an inlet pipe and an outlet pipe sequentially, and an overflow valve is disposed between the inlet pipe and the outlet pipe.
 14. The plunger pump according to claim 13, wherein the pump body is provided with a piston ring connected to the plunger body, the piston ring comprises a piston ring body, a plunger sleeve positioned inside the piston ring body, and a reinforcing rib positioned between an outer wall of the plunger sleeve and an inner wall of the piston ring body, and both the plunger sleeve and the piston ring body are fixedly connected with the reinforcing rib.
 15. The plunger pump according to claim 13, wherein the pump body and the plunger sleeve are connected with each other at a position where a sealing gasket is provided.
 16. The plunger pump according to claim 15, wherein the pump body is provided with a piston ring connected to the plunger body, the piston ring comprises a piston ring body, a plunger sleeve positioned inside the piston ring body, and a reinforcing rib positioned between an outer wall of the plunger sleeve and an inner wall of the piston ring body, and both the plunger sleeve and the piston ring body are fixedly connected with the reinforcing rib.
 17. The plunger pump according to claim 15, further comprising a controller, a buzzer for alarm, a switch provided with a solenoid valve, a current overload protector configured to detect a current, and a temperature sensor configured to detect a temperature of the pump body, wherein the buzzer, the switch, the overload protector, and the temperature sensor are all electrically connected with the controller.
 18. The plunger pump according to claim 8, further comprising a pump body and a motor configured for actuating movement of the pump body, wherein the pump body is fixedly connected with an inlet pipe and an outlet pipe sequentially, and an overflow valve is disposed between the inlet pipe and the outlet pipe.
 19. The plunger pump according to claim 18, wherein the pump body is provided with a piston ring connected to the plunger body, the piston ring comprises a piston ring body, a plunger sleeve positioned inside the piston ring body, and a reinforcing rib positioned between an outer wall of the plunger sleeve and an inner wall of the piston ring body, and both the plunger sleeve and the piston ring body are fixedly connected with the reinforcing rib.
 20. The plunger pump according to claim 19, wherein the pump body and the plunger sleeve are connected with each other at a position where a sealing gasket is provided; and further comprising a controller, a buzzer for alarm, a switch provided with a solenoid valve, a current overload protector configured to detect a current, and a temperature sensor configured to detect a temperature of the pump body, wherein the buzzer, the switch, the overload protector, and the temperature sensor are all electrically connected with the controller. 